All RK chains are pre-stressed and pre-stretched to ensure equal load distribution and minimal maintenance. They're made of the highest-grade medium carbon alloy steel available, with all components shot-peened and heat treated.

A properly lubricated, heavy-duty racing non 'O' Ring chain will perform efficiently as long as there is a 'lubricating oil boundary layer' between critical bearing surfaces. However, once the boundary layer dissipates from high speed running, lack of maintenance, or simply over time, the inner bearing surfaces will overheat, kink, cause severe drag, and ultimately fail. RK 'O' Ring chains prevent this from happening by continuously lubricating and protecting critical internal bearing surfaces.

RK Blue - 'O' Ring Chain

Tested to be 4% more efficient than alternatives above 6,000 revs. Dyno curve available. Non-stretch - extended life. Sizes 100-116L

RK Gold/Black - Non 'O' Ring Chain

No breakages reported after several hundred laps tested by FSA drivers. Less stretch than equivalent competitor products. Sizes 98L to 114L